For the full schematics, wiring diagrams, and the latest software code, visit the official K3NG GitHub Wiki . The Radio Artisan Blog is also a key resource for troubleshooting and design ideas.
Supports iambic modes (A, B, Ultimatic), memory macros, serial terminal control, and QRSS.
For the next three hours, the basement was silent except for the hum of the soldering iron and the soft click of components snapping into a breadboard. Elias stopped fighting the circuit and started following the roadmap.
Once the basic keyer works, you can add features defined in the keyer_pin_settings.h file. A k3ng keyer schematic
Ideal for testing. Use jumper wires to link an Arduino Nano to your components. It is prone to loose connections but perfect for verifying that your code configuration matches your hardware layout.
Can be connected directly to a digital pin and ground.
Building the K3NG Keyer requires basic electronics skills and knowledge of soldering. The keyer can be built on a breadboard or a PCB (Printed Circuit Board). For the full schematics, wiring diagrams, and the
Now that the keyer could "hear," it needed to "speak." Elias wanted to use the keyer to drive his vintage 1960s tube transmitter (a "boat anchor"). He looked at the Output Stage on the schematic.
If your rig doesn't have a built-in sidetone, or if you want to practice offline, the schematic requires an audio monitor.
The core of the K3NG keyer is an Arduino board (Arduino Uno or Mega), which serves as the "brain." The schematic is modular, meaning you can build a basic keyer or a feature-rich unit. Core Components of the Schematic For the next three hours, the basement was
Do not solder components immediately. Use a breadboard to verify that the software and connections work.
Transistor stages buffer the transmitter keying lines. In the most common schematic approach, each key line from the microcontroller drives a small NPN transistor (2N3904 or 2N2222) or a MOSFET (2N7000) that pulls the transceiver’s key input to ground when active. This isolation protects the Arduino from the higher voltages that may be present on the key‑line interface.
Similarly, a rotary encoder with a built‑in push button is a popular method for adjusting speed and navigating menus. The typical schematic connects two encoder pins to digital inputs (with pull‑up resistors) and the push‑button to a third digital input. An R/C low‑pass filter (e.g., 1 kΩ and 0.1 µF) can be added to debounce the encoder outputs, though the software also provides software debouncing.
: Non-volatile storage for standard contest exchanges and CQ calls.